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<http://webisa.webdatacommons.org/241711560>	<http://www.w3.org/ns/prov#value>	"For example, the output range finding device 46 a may take the form of a light source, such as a laser diode, LED or other directional light source, while the input range finding device 46 b may take the form an optical sensor such as a photodiode, Vidicon or other photosensitive device for detecting light reflected from the target 20." .